<carousel>
  <slide class="switch_pic">
    <img src="../../../assets/images/tab1.jpg" alt="First slide">
    <div class="carousel-caption">
      <p>内容在火星.</p>
    </div>
  </slide>
  <slide class="switch_pic">
    <img src="../../../assets/images/tab2.jpg" alt="Second slide">
    <div class="carousel-caption">
      <p>内容在火星.</p>
    </div>
  </slide>
</carousel>
